As for the ISP failover/traffic splitting there are varying configuration possiblities. The simplest, is to just modify your static routes to include a qualified-next-hop. Again, there are several ways to configure the actual failover/HA portion between your ISPs but clustering your SRXs and connecting both ISPs to them is the best redundancy.
Controlling traffic is a key facet of internet management. Sometimes primary connections will go down. Or too much traffic may cause congested links or overwhelmed devices to become unusable. We wrote about the implementation of load balancing in the cloud in a 2017 blog post. When people think of load balancing, they usually think about traffic that is inbound to the server or a network. But what about traffic that goes outbound from the client or internet user or your office? The wide area network (WAN) or internet links going from a site to multiple internet service providers (ISP) can also be load balanced. While Total Uptime does not provide this type of outbound load balancing, we're often asked for our recommendations on this subject. So continue reading if you too are looking for a solution.
IP MONITORING WITH FBF (FILTER BASED FORWARDING IN A DUAL ISP SCENARIO) THE IP MONITORING WITH ROUTE FAILOVER FEATURE IS AVAILABLE FROM 11.2 RELEASE. THIS ARTICLE DEALS WITH THE SPECIFIC CONFIGURATION OF THIS FEATURE TO PERFORM A ROUTE-FAILOVER IN A TYPICAL DUAL ISP SCENARIO. We have two ISPs one terminating on ge-0/0/0 & the other on ge-0/0/1. Dual WAN Load Balancing vs Failover I have a building that we're providing internet for about 60 subs. We've been having issues with our main ISP, so we've gotten a second WISP connection as a backup. While enabling Dual WAN, you can select two ISP connections to your router, a primary WAN and a secondary WAN. There are two modes you can choose to enable when using Dual WAN. Failover and Failback Mode. Those route maps are bing used by the nat to be able to do the translation of the ip address 172.168.60.2 to the public ip address based on each exit interface, in other words to let nat do the translation either if the host 172.168.60.2 exits via the f0/0 interface or f1/0 each with a specific public ip address.
The Need for Redundancy
Nat Failover With Dual Isp Dhcp
As individuals, we have all become dependent on the internet. But for some businesses, uninterrupted internet access is mission critical. Outbound load balancing is bound up with the requirement for failover protection. Of course, balancing ISP links means that there are two or more internet connections in place. (The term outbound may be a misnomer, since the internet connections established through ISP links are actually bi-directional.)
Failover means that when the primary connection is down, the secondary connection takes over.
Failover means that when the primary connection is down, the secondary connection takes over. If two ISP links are set up so that the primary link takes 100% of the traffic, then there is no load balancing implemented. Load balancing may be weighted 80%-20% or 50%-50%, or set up using any of the other load balancing methods discussed in F5's white paper 'Load Balancing 101: Nuts and Bolts'. But no matter the load balancing configuration, failover works the same way. The remaining active link (or links) takes over the traffic from the failed link.
Load Balancing the Internet
The principles of load balancing remain the same in any environment, although the circumstances and implementations will vary. Internet service providers use balancing strategies to handle fluctuating amounts of inbound internet traffic, and load balancing the cloud has its own peculiar aspects. The matter at hand, load balancing multiple ISP connections, can be done very simply using GUI selections in many off-the-shelf appliances. But it can also be accomplished the old fashioned way, using routers or Linux servers that are manually configured.
There are different reasons for ISP load balancing. One ISP may be considered more efficient or less expensive than another. Load balancing at 100%-0% is virtually the same as failover. Some solutions may provide additional parameters in their software.
Survey of Load Balancing/Failover Options
Total Uptime provides inbound load balancing as part of our service offerings. We thought it also might be helpful to inform our customers about outbound load balancing solutions. We offer this survey as an introduction to low-cost products or solutions that might meet your needs. The following should not be considered a complete list or a comprehensive description of the solutions. You can do more research on your own.
Nat Failover With Dual Isp Connection
NOTE: The product models listed are only examples. There may be other devices or solutions in each manufacturer's product line that also handle load balancing and failover. Some vendors, like Cisco, may have many solutions to choose from.
Cisco ASA
The Cisco ASA has been around for quite some time and is a popular SMB and Enterprise device. This appliance-based firewall supports redundant or backup ISP links in an active/standby configuration. Older editions like the ASA 5510 to the newer 5500-X Series running software Version 9.x or later easily support this feature. This article discusses the configuration in detail.
Cisco Routers
If you have a Cisco router at the edge of your network such as an ASR, ISR or even an older generation like a 1900, 2900 or 3900, there are two options for you to consider. The first is implementing IP SLA to monitor your ISP links and make automated route changes based on the Jitter, Packet loss, connectivity and more. This is the more rudimentary approach and appears to be a licensed feature, so it may not be included by default. Another option is to consider is doing what the big boys do, deploy multihoming with BGP. According to Techopedia, 'multihoming helps load balancing and allows a network to work with the lowest downtime'. Connecting a single host computer to multiple networks can increase reliability and improve performance. This method is dependent on a dynamic routing protocol such as BGP and should be possible with any router that handles the protocol, of which there are many.
Juniper Routers and Firewalls
One of our personal favorites is Juniper. We use their MX series routers here at Total Uptime, and the MX series (like other routing platforms they offer) support BGP. So if you're inclined to go that route, like Cisco, you can multihome to two or more ISPs who support that routing protocol for the ultimate in ingress and egress redundancy.
But it is important to note that their SRX Next-Generation Firewalls also support dual ISP links with failover so if you only need a simple firewall, it is an excellent choice as well.
Fortinet FortiGate
Fortinet manufacturers a long line-up of firewalls and from our research, they all support multiple WAN connections from the 60-E and up. In their online documentation called The Fortinet Cookbook, the manufacturer offers a recipe for Redundant Internet Connections. The FortiGate device is considered a next-generation firewall (NGFW) by the company. It can combine connections from two internet service providers (ISPs) into a single firewall. The steps include setting up WAN Link Load Balancing (LLB) using the device's GUI. Then it's possible to use weighted settings and other parameters to create a Load Balancing Algorithm. Fortinet offers more information on various methods of load balancing in a help page called WAN link load balancing.
One of the neatest features we've seen is the native ability to plug in a 4G LTE USB dongle to provide WAN connectivity where other traditional connections like Cable, DSL or Fiber options are not available.
Barracuda NextGen Firewall
Barracuda offers a way to balance traffic among multiple links with their next generation firewalls. . You can learn more about it on the page How to Configure Outbound Load Balancing and Failover in their Barracuda Campus documentation. The instructions show how NAT and multilink policy are implemented to balance the load. You can also assign a metric to each ISP connection.
You may also want to check out the Barracuda Link Balancer which claims to offer cost-effective Internet Performance and Availability by dynamically balancing traffic across multiple ISP links.
Check Point UTM-1
The UTM-1 Edge Series is a product family offered by Check Point. Their documentation for Configuring WAN Load Balancing says that by default the UTM-1 routes all traffic to the primary connection. That can be altered by using a routing rule. You can also assign weights to the ISP connection to automatically distribute the load. You can learn more about Check Point ISP redundancy here.
SonicWall
According to SonicWall, there are several devices that support load balancing and failover including their next-generation firewalls from the SOHO model all the way up to the TZ600. They also support using 4G LTE as an optional WAN connection too.
Mettle Networks
Outbound load balancing is a standard feature in all Mettle SE devices sold by Mettle Networks. We picked the first one on their list. Mettle Networks recognizes that one link to the internet is just not enough for some businesses. And they say that their load balancing is done in a 'bandwidth-aware' way. The Mettle SE includes VLAN support.
Untangle
The Untangle NG Firewall appliance was recommended by several techs on various discussion boards. The company also has a WAN balancer app that you can try with an online demo. Free download games onet untuk laptop.
At the risk of leaving anybody out, we'll list a few more options below. You can investigate further on your own, or look around for a solution not included here.
Some Considerations
The platform that you select will depend a lot on capabilities and resources within your company. You may have some of this equipment lying around unused that you could repurpose for ISP load balancing and failover. Or you may know where to get your hands on it for a good price. What about expertise? Maybe you already have in-house expertise on certain platforms. Broadsword quest steps. Or it may be that managers in your company swear by a certain vendor and won't buy anything else.
Then there is ease of use and price. If you're looking for an easy way, then you'll want to pick up one that has a simple graphical interface for setting up your ISP connections. If you're on a budget, then you need to make sure that you don't overbuy and get a sophisticated and expensive router when all you need is a basic appliance.
Cisco Nat Failover Dual Isp
Don't Forget Inbound
Total Uptime has you covered for inbound load balancing and failover. While these appliances are designed to keep staff online and accessing the Internet (outbound traffic), any on-premise hosted applications such as a website or mail server will still become inaccessible unless you have a means to update DNS automatically and/or redirect traffic destined to one ISP link to another.
Conclusion
This is not meant to be a full-fledged product review. The author of this blog post does not have a decked-out lab along with the supply of product demos from eager vendors. The information here has been gleaned from various vendor sites, discussion boards, and articles online. In the whole scheme of networking, setting up redundant ISP links and making them share the load shouldn't be too difficult an assignment. It all depends on your technical background coupled with your courage to figure it out. But based on our experience, there's always a way to make things happen — even if it's a workaround. In this case, there's more than one way to make the best of a pair of ISP links.
Know of any other devices that support multiple WAN or ISP links? Let us know and we'll update this post.
IT Network
For network today, WAN redundancy with multiple internet connections is very important not only in the enterprise networks but even in some small networks also need two ISP for dual WAN connection. To achieve the objective of having redundant WAN connectivity for a network, it must have different connections with two ISP.
In this article will show how to configure dual WAN failover on single Cisco router with IP SLA tracking to have redundancy with multiple internet connections.
In this article of how to configure dual WAN failover on single Cisco router, it is assumed that:
a. you already have GNS3 VM virtual server installed up and running on your computer. In case that you don't, please refer to this link. Installing GNS3 VM on VMware Workstation
b. You know how to configure NAT, network address translation, on Cisco router. If you do not, you can refer this link Configuring Network Address Translation (NAT) on Cisco Router.
To demonstrate how to configure dual WAN failover on single Cisco router , we will set up a GNS3 lab as the following IP network diagram.
There are three Cisco routers. R1 is the router in customer network and the other two routers will act like two different ISP, so we have multiple internet connections for the customer network. ISP01 is the primary connection and ISP02 is the secondary connection for customer router R1. In case that customer router R1 can not reach ISP01, it will automatically switch over to ISP02 to achieve WAN redundancy. There is one router PC1 within the LAN network acting as computer client.
Now let configure the IP address setting on PC1
On customer router R1 configure the following IP address settings
On ISP01 router, configure the following IP address settings
On ISP02 router, configure the following IP address settings
To connect ISP01 to ISP02 we need to configure a routing protocol. It can be the static routing or dynamic routing protocol, but in our case now let use OSPF dynamic routing protocol to connect these two ISP.
On ISP01 router, configure OSPF dynamic routing protocol as the below.
On ISP02 router, configure OSPF dynamic routing protocol as the below.
The first thing that we need to do here to have WAN redundancy with multiple internet connections is to configure dynamic NAT, dynamic network address translation, on Cisco router that connected directly to two ISP. So, clients computer within the internal network can reach to internet.
To configure dynamic NAT on Cisco router, we need to create an ACL to contain the IP address to be NATed. In below ACL, we allow all IP in the LAN can access to the internet.
For multiple internet connections of WAN redundancy we need to configure route maps to select which traffic to be NATed for each WAN interface of these two ISP.
After configured an access control list , then we need to configure dynamic NAT with the created ACL above.
Now we need to configure IP SLA on Cisco router with dual wan connection, to ping the public IP address of ISP01 since we had decided to use this ISP as the primary connection.
Then, we need to apply the IP SLA configured above with default routes configuration on our dual wan connection Cisco router. So, we can have WAN redundancy for our network.
The track number which is specified with default routes configuration will be installed only if Cisco router with dual wan connection can reach the public IP of ISP01. So, if ISP01 cannot be reached by our dual wan connection Cisco router, the secondary default routes will be used to forward all the traffic to ISP02.
To test if the configuration of WAN redundancy of multiple internet connections work or not, we can ping to the public IP address these two ISP which is 102.102.102.1 or 102.102.102.2 for our case now. We should get the following successful result.
After we know that ping to the public IP address of these two ISP is successful, we can check the traceroute command to see which path that it go to reach that public IP address. Base on the following traceroute result, it reach 102.102.102.2 via ISP01.
If we check the routing table on our dual wan connection Cisco router, the default routes must be pointing to the public IP address of ISP01 which is 100.100.100.2. So, this means that right now our dual wan connection Cisco router is forwarding all the traffic to the internet vial ISP01.
Let also check the NAT configuration of WAN redundancy of multiple internet connections work or not. It should be NATed to the IP address of ISP01 as the following.
Now we need to test if it is failover to ISP02 or not in case that ISP01 not reachable from our dual wan connection Cisco router. So, can know that our configuration for WAN redundancy with multiple internet connections work or not. To test this, we can remove the IP address configuration on the interface f0/0 of ISP01 router.
After finished removing the IP address on the interface f0/0 of ISP01 router, we should get the follow message log on our dual wan connection Cisco router.
If we check the routing table on our dual wan connection Cisco router, the default routes must be pointing to the public IP address of ISP02 which 200.200.200.2. So, this means that right now our dual wan connection Cisco router is forwarding all the traffic to the internet vial ISP02.
Now let check the traceroute result again. As we can we below, our dual wan connection Cisco router can reach that public IP address 102.102.102.1 via ISP02 connection.
Let check the NAT configuration of WAN redundancy of multiple internet connections again. It should be NATed to the IP address of ISP02 as the following for now.
That's all about how to configure dual WAN failover on single Cisco router from Tech Space KH. This is a cheap and simple method to achieve the objective of WAN redundancy with multiple internet connections. Hopefully, you can find this guide informative. If you have any questions or suggestions you can always leave your comments below. I will try all of my best to review and reply them.
IT Network
For network today, WAN redundancy with multiple internet connections is very important not only in the enterprise networks but even in some small networks also need two ISP for dual WAN connection. To achieve the objective of having redundant WAN connectivity for a network, it must have different connections with two ISP.
In this article will show how to configure dual WAN failover on single Cisco router with IP SLA tracking to have redundancy with multiple internet connections.
In this article of how to configure dual WAN failover on single Cisco router, it is assumed that:
a. you already have GNS3 VM virtual server installed up and running on your computer. In case that you don't, please refer to this link. Installing GNS3 VM on VMware Workstation
b. You know how to configure NAT, network address translation, on Cisco router. If you do not, you can refer this link Configuring Network Address Translation (NAT) on Cisco Router.
To demonstrate how to configure dual WAN failover on single Cisco router , we will set up a GNS3 lab as the following IP network diagram.
There are three Cisco routers. R1 is the router in customer network and the other two routers will act like two different ISP, so we have multiple internet connections for the customer network. ISP01 is the primary connection and ISP02 is the secondary connection for customer router R1. In case that customer router R1 can not reach ISP01, it will automatically switch over to ISP02 to achieve WAN redundancy. There is one router PC1 within the LAN network acting as computer client.
Now let configure the IP address setting on PC1
On customer router R1 configure the following IP address settings
On ISP01 router, configure the following IP address settings
On ISP02 router, configure the following IP address settings
To connect ISP01 to ISP02 we need to configure a routing protocol. It can be the static routing or dynamic routing protocol, but in our case now let use OSPF dynamic routing protocol to connect these two ISP.
On ISP01 router, configure OSPF dynamic routing protocol as the below.
On ISP02 router, configure OSPF dynamic routing protocol as the below.
The first thing that we need to do here to have WAN redundancy with multiple internet connections is to configure dynamic NAT, dynamic network address translation, on Cisco router that connected directly to two ISP. So, clients computer within the internal network can reach to internet.
To configure dynamic NAT on Cisco router, we need to create an ACL to contain the IP address to be NATed. In below ACL, we allow all IP in the LAN can access to the internet.
For multiple internet connections of WAN redundancy we need to configure route maps to select which traffic to be NATed for each WAN interface of these two ISP.
After configured an access control list , then we need to configure dynamic NAT with the created ACL above.
Now we need to configure IP SLA on Cisco router with dual wan connection, to ping the public IP address of ISP01 since we had decided to use this ISP as the primary connection.
Then, we need to apply the IP SLA configured above with default routes configuration on our dual wan connection Cisco router. So, we can have WAN redundancy for our network.
The track number which is specified with default routes configuration will be installed only if Cisco router with dual wan connection can reach the public IP of ISP01. So, if ISP01 cannot be reached by our dual wan connection Cisco router, the secondary default routes will be used to forward all the traffic to ISP02.
To test if the configuration of WAN redundancy of multiple internet connections work or not, we can ping to the public IP address these two ISP which is 102.102.102.1 or 102.102.102.2 for our case now. We should get the following successful result.
After we know that ping to the public IP address of these two ISP is successful, we can check the traceroute command to see which path that it go to reach that public IP address. Base on the following traceroute result, it reach 102.102.102.2 via ISP01.
If we check the routing table on our dual wan connection Cisco router, the default routes must be pointing to the public IP address of ISP01 which is 100.100.100.2. So, this means that right now our dual wan connection Cisco router is forwarding all the traffic to the internet vial ISP01.
Let also check the NAT configuration of WAN redundancy of multiple internet connections work or not. It should be NATed to the IP address of ISP01 as the following.
Now we need to test if it is failover to ISP02 or not in case that ISP01 not reachable from our dual wan connection Cisco router. So, can know that our configuration for WAN redundancy with multiple internet connections work or not. To test this, we can remove the IP address configuration on the interface f0/0 of ISP01 router.
After finished removing the IP address on the interface f0/0 of ISP01 router, we should get the follow message log on our dual wan connection Cisco router.
If we check the routing table on our dual wan connection Cisco router, the default routes must be pointing to the public IP address of ISP02 which 200.200.200.2. So, this means that right now our dual wan connection Cisco router is forwarding all the traffic to the internet vial ISP02.
Now let check the traceroute result again. As we can we below, our dual wan connection Cisco router can reach that public IP address 102.102.102.1 via ISP02 connection.
Let check the NAT configuration of WAN redundancy of multiple internet connections again. It should be NATed to the IP address of ISP02 as the following for now.
That's all about how to configure dual WAN failover on single Cisco router from Tech Space KH. This is a cheap and simple method to achieve the objective of WAN redundancy with multiple internet connections. Hopefully, you can find this guide informative. If you have any questions or suggestions you can always leave your comments below. I will try all of my best to review and reply them.
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